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1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * NFS internal definitions
4  */
5 
6 #include "nfs4_fs.h"
7 #include <linux/mount.h>
8 #include <linux/security.h>
9 #include <linux/crc32.h>
10 #include <linux/nfs_page.h>
11 #include <linux/wait_bit.h>
12 
13 #define NFS_MS_MASK (SB_RDONLY|SB_NOSUID|SB_NODEV|SB_NOEXEC|SB_SYNCHRONOUS)
14 
15 extern const struct export_operations nfs_export_ops;
16 
17 struct nfs_string;
18 
nfs_attr_check_mountpoint(struct super_block * parent,struct nfs_fattr * fattr)19 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
20 {
21 	if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
22 		fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
23 }
24 
nfs_attr_use_mounted_on_fileid(struct nfs_fattr * fattr)25 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
26 {
27 	if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
28 	    (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
29 	     ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
30 		return 0;
31 	return 1;
32 }
33 
34 struct nfs_clone_mount {
35 	const struct super_block *sb;
36 	const struct dentry *dentry;
37 	struct nfs_fh *fh;
38 	struct nfs_fattr *fattr;
39 	char *hostname;
40 	char *mnt_path;
41 	struct sockaddr *addr;
42 	size_t addrlen;
43 	rpc_authflavor_t authflavor;
44 };
45 
46 /*
47  * Note: RFC 1813 doesn't limit the number of auth flavors that
48  * a server can return, so make something up.
49  */
50 #define NFS_MAX_SECFLAVORS	(12)
51 
52 /*
53  * Value used if the user did not specify a port value.
54  */
55 #define NFS_UNSPEC_PORT		(-1)
56 
57 #define NFS_UNSPEC_RETRANS	(UINT_MAX)
58 #define NFS_UNSPEC_TIMEO	(UINT_MAX)
59 
60 /*
61  * Maximum number of pages that readdir can use for creating
62  * a vmapped array of pages.
63  */
64 #define NFS_MAX_READDIR_PAGES 8
65 
66 struct nfs_client_initdata {
67 	unsigned long init_flags;
68 	const char *hostname;			/* Hostname of the server */
69 	const struct sockaddr *addr;		/* Address of the server */
70 	const char *nodename;			/* Hostname of the client */
71 	const char *ip_addr;			/* IP address of the client */
72 	size_t addrlen;
73 	struct nfs_subversion *nfs_mod;
74 	int proto;
75 	u32 minorversion;
76 	unsigned int nconnect;
77 	struct net *net;
78 	const struct rpc_timeout *timeparms;
79 	const struct cred *cred;
80 };
81 
82 /*
83  * In-kernel mount arguments
84  */
85 struct nfs_parsed_mount_data {
86 	int			flags;
87 	unsigned int		rsize, wsize;
88 	unsigned int		timeo, retrans;
89 	unsigned int		acregmin, acregmax,
90 				acdirmin, acdirmax;
91 	unsigned int		namlen;
92 	unsigned int		options;
93 	unsigned int		bsize;
94 	struct nfs_auth_info	auth_info;
95 	rpc_authflavor_t	selected_flavor;
96 	char			*client_address;
97 	unsigned int		version;
98 	unsigned int		minorversion;
99 	char			*fscache_uniq;
100 	bool			need_mount;
101 
102 	struct {
103 		struct sockaddr_storage	address;
104 		size_t			addrlen;
105 		char			*hostname;
106 		u32			version;
107 		int			port;
108 		unsigned short		protocol;
109 	} mount_server;
110 
111 	struct {
112 		struct sockaddr_storage	address;
113 		size_t			addrlen;
114 		char			*hostname;
115 		char			*export_path;
116 		int			port;
117 		unsigned short		protocol;
118 		unsigned short		nconnect;
119 	} nfs_server;
120 
121 	void			*lsm_opts;
122 	struct net		*net;
123 };
124 
125 /* mount_clnt.c */
126 struct nfs_mount_request {
127 	struct sockaddr		*sap;
128 	size_t			salen;
129 	char			*hostname;
130 	char			*dirpath;
131 	u32			version;
132 	unsigned short		protocol;
133 	struct nfs_fh		*fh;
134 	int			noresvport;
135 	unsigned int		*auth_flav_len;
136 	rpc_authflavor_t	*auth_flavs;
137 	struct net		*net;
138 };
139 
140 struct nfs_mount_info {
141 	void (*fill_super)(struct super_block *, struct nfs_mount_info *);
142 	int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
143 	struct nfs_parsed_mount_data *parsed;
144 	struct nfs_clone_mount *cloned;
145 	struct nfs_fh *mntfh;
146 };
147 
148 extern int nfs_mount(struct nfs_mount_request *info);
149 extern void nfs_umount(const struct nfs_mount_request *info);
150 
151 /* client.c */
152 extern const struct rpc_program nfs_program;
153 extern void nfs_clients_init(struct net *net);
154 extern void nfs_clients_exit(struct net *net);
155 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
156 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
157 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
158 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
159 void nfs_server_insert_lists(struct nfs_server *);
160 void nfs_server_remove_lists(struct nfs_server *);
161 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
162 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
163 		rpc_authflavor_t);
164 struct nfs_server *nfs_alloc_server(void);
165 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
166 
167 extern void nfs_put_client(struct nfs_client *);
168 extern void nfs_free_client(struct nfs_client *);
169 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
170 extern struct nfs_client *
171 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
172 				struct nfs4_sessionid *, u32);
173 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
174 					struct nfs_subversion *);
175 extern struct nfs_server *nfs4_create_server(
176 					struct nfs_mount_info *,
177 					struct nfs_subversion *);
178 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
179 						      struct nfs_fh *);
180 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
181 					struct sockaddr *sap, size_t salen,
182 					struct net *net);
183 extern void nfs_free_server(struct nfs_server *server);
184 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
185 					   struct nfs_fh *,
186 					   struct nfs_fattr *,
187 					   rpc_authflavor_t);
188 extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
189 extern int nfs_client_init_status(const struct nfs_client *clp);
190 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
191 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
192 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
193 					     const struct sockaddr *ds_addr,
194 					     int ds_addrlen, int ds_proto,
195 					     unsigned int ds_timeo,
196 					     unsigned int ds_retrans,
197 					     u32 minor_version);
198 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
199 						struct inode *);
200 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
201 			const struct sockaddr *ds_addr, int ds_addrlen,
202 			int ds_proto, unsigned int ds_timeo,
203 			unsigned int ds_retrans);
204 #ifdef CONFIG_PROC_FS
205 extern int __init nfs_fs_proc_init(void);
206 extern void nfs_fs_proc_exit(void);
207 extern int nfs_fs_proc_net_init(struct net *net);
208 extern void nfs_fs_proc_net_exit(struct net *net);
209 #else
nfs_fs_proc_net_init(struct net * net)210 static inline int nfs_fs_proc_net_init(struct net *net)
211 {
212 	return 0;
213 }
nfs_fs_proc_net_exit(struct net * net)214 static inline void nfs_fs_proc_net_exit(struct net *net)
215 {
216 }
nfs_fs_proc_init(void)217 static inline int nfs_fs_proc_init(void)
218 {
219 	return 0;
220 }
nfs_fs_proc_exit(void)221 static inline void nfs_fs_proc_exit(void)
222 {
223 }
224 #endif
225 
226 /* callback_xdr.c */
227 extern const struct svc_version nfs4_callback_version1;
228 extern const struct svc_version nfs4_callback_version4;
229 
230 struct nfs_pageio_descriptor;
231 /* pagelist.c */
232 extern int __init nfs_init_nfspagecache(void);
233 extern void nfs_destroy_nfspagecache(void);
234 extern int __init nfs_init_readpagecache(void);
235 extern void nfs_destroy_readpagecache(void);
236 extern int __init nfs_init_writepagecache(void);
237 extern void nfs_destroy_writepagecache(void);
238 
239 extern int __init nfs_init_directcache(void);
240 extern void nfs_destroy_directcache(void);
241 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
242 			      struct nfs_pgio_header *hdr,
243 			      void (*release)(struct nfs_pgio_header *hdr));
244 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
245 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
246 
247 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
248 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
249 void nfs_pgio_header_free(struct nfs_pgio_header *);
250 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
251 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
252 		      const struct cred *cred, const struct nfs_rpc_ops *rpc_ops,
253 		      const struct rpc_call_ops *call_ops, int how, int flags);
254 void nfs_free_request(struct nfs_page *req);
255 struct nfs_pgio_mirror *
256 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
257 
nfs_pgio_has_mirroring(struct nfs_pageio_descriptor * desc)258 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
259 {
260 	WARN_ON_ONCE(desc->pg_mirror_count < 1);
261 	return desc->pg_mirror_count > 1;
262 }
263 
nfs_match_open_context(const struct nfs_open_context * ctx1,const struct nfs_open_context * ctx2)264 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
265 		const struct nfs_open_context *ctx2)
266 {
267 	return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state;
268 }
269 
270 /* nfs2xdr.c */
271 extern const struct rpc_procinfo nfs_procedures[];
272 extern int nfs2_decode_dirent(struct xdr_stream *,
273 				struct nfs_entry *, bool);
274 
275 /* nfs3xdr.c */
276 extern const struct rpc_procinfo nfs3_procedures[];
277 extern int nfs3_decode_dirent(struct xdr_stream *,
278 				struct nfs_entry *, bool);
279 
280 /* nfs4xdr.c */
281 #if IS_ENABLED(CONFIG_NFS_V4)
282 extern int nfs4_decode_dirent(struct xdr_stream *,
283 				struct nfs_entry *, bool);
284 #endif
285 #ifdef CONFIG_NFS_V4_1
286 extern const u32 nfs41_maxread_overhead;
287 extern const u32 nfs41_maxwrite_overhead;
288 extern const u32 nfs41_maxgetdevinfo_overhead;
289 #endif
290 
291 /* nfs4proc.c */
292 #if IS_ENABLED(CONFIG_NFS_V4)
293 extern const struct rpc_procinfo nfs4_procedures[];
294 #endif
295 
296 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
297 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
298 static inline struct nfs4_label *
nfs4_label_copy(struct nfs4_label * dst,struct nfs4_label * src)299 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
300 {
301 	if (!dst || !src)
302 		return NULL;
303 
304 	if (src->len > NFS4_MAXLABELLEN)
305 		return NULL;
306 
307 	dst->lfs = src->lfs;
308 	dst->pi = src->pi;
309 	dst->len = src->len;
310 	memcpy(dst->label, src->label, src->len);
311 
312 	return dst;
313 }
nfs4_label_free(struct nfs4_label * label)314 static inline void nfs4_label_free(struct nfs4_label *label)
315 {
316 	if (label) {
317 		kfree(label->label);
318 		kfree(label);
319 	}
320 	return;
321 }
322 
nfs_zap_label_cache_locked(struct nfs_inode * nfsi)323 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
324 {
325 	if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
326 		nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
327 }
328 #else
nfs4_label_alloc(struct nfs_server * server,gfp_t flags)329 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
nfs4_label_free(void * label)330 static inline void nfs4_label_free(void *label) {}
nfs_zap_label_cache_locked(struct nfs_inode * nfsi)331 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
332 {
333 }
334 static inline struct nfs4_label *
nfs4_label_copy(struct nfs4_label * dst,struct nfs4_label * src)335 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
336 {
337 	return NULL;
338 }
339 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
340 
341 /* proc.c */
342 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
343 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
344 			   const struct nfs_client_initdata *);
345 
346 /* dir.c */
347 extern void nfs_advise_use_readdirplus(struct inode *dir);
348 extern void nfs_force_use_readdirplus(struct inode *dir);
349 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
350 					    struct shrink_control *sc);
351 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
352 					   struct shrink_control *sc);
353 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
354 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
355 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
356 int nfs_rmdir(struct inode *, struct dentry *);
357 int nfs_unlink(struct inode *, struct dentry *);
358 int nfs_symlink(struct inode *, struct dentry *, const char *);
359 int nfs_link(struct dentry *, struct inode *, struct dentry *);
360 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
361 int nfs_rename(struct inode *, struct dentry *,
362 	       struct inode *, struct dentry *, unsigned int);
363 
364 /* file.c */
365 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
366 loff_t nfs_file_llseek(struct file *, loff_t, int);
367 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
368 int nfs_file_mmap(struct file *, struct vm_area_struct *);
369 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
370 int nfs_file_release(struct inode *, struct file *);
371 int nfs_lock(struct file *, int, struct file_lock *);
372 int nfs_flock(struct file *, int, struct file_lock *);
373 int nfs_check_flags(int);
374 
375 /* inode.c */
376 extern struct workqueue_struct *nfsiod_workqueue;
377 extern struct inode *nfs_alloc_inode(struct super_block *sb);
378 extern void nfs_free_inode(struct inode *);
379 extern int nfs_write_inode(struct inode *, struct writeback_control *);
380 extern int nfs_drop_inode(struct inode *);
381 extern void nfs_clear_inode(struct inode *);
382 extern void nfs_evict_inode(struct inode *);
383 void nfs_zap_acl_cache(struct inode *inode);
384 extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
385 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
386 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode);
387 
388 /* super.c */
389 extern const struct super_operations nfs_sops;
390 extern struct file_system_type nfs_fs_type;
391 extern struct file_system_type nfs_xdev_fs_type;
392 #if IS_ENABLED(CONFIG_NFS_V4)
393 extern struct file_system_type nfs4_referral_fs_type;
394 #endif
395 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
396 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
397 			struct nfs_subversion *);
398 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
399 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
400 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
401 				   struct nfs_mount_info *, struct nfs_subversion *);
402 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
403 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
404 		const char *, struct nfs_mount_info *);
405 void nfs_kill_super(struct super_block *);
406 void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
407 
408 extern struct rpc_stat nfs_rpcstat;
409 
410 extern int __init register_nfs_fs(void);
411 extern void __exit unregister_nfs_fs(void);
412 extern bool nfs_sb_active(struct super_block *sb);
413 extern void nfs_sb_deactive(struct super_block *sb);
414 extern int nfs_client_for_each_server(struct nfs_client *clp,
415 				      int (*fn)(struct nfs_server *, void *),
416 				      void *data);
417 /* io.c */
418 extern void nfs_start_io_read(struct inode *inode);
419 extern void nfs_end_io_read(struct inode *inode);
420 extern void nfs_start_io_write(struct inode *inode);
421 extern void nfs_end_io_write(struct inode *inode);
422 extern void nfs_start_io_direct(struct inode *inode);
423 extern void nfs_end_io_direct(struct inode *inode);
424 
nfs_file_io_is_buffered(struct nfs_inode * nfsi)425 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
426 {
427 	return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
428 }
429 
430 /* namespace.c */
431 #define NFS_PATH_CANONICAL 1
432 extern char *nfs_path(char **p, struct dentry *dentry,
433 		      char *buffer, ssize_t buflen, unsigned flags);
434 extern struct vfsmount *nfs_d_automount(struct path *path);
435 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
436 			      struct nfs_fh *, struct nfs_fattr *);
437 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
438 				 struct nfs_fattr *, rpc_authflavor_t);
439 
440 /* getroot.c */
441 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
442 				   const char *);
443 #if IS_ENABLED(CONFIG_NFS_V4)
444 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
445 				    const char *);
446 
447 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
448 #endif
449 
450 struct nfs_pgio_completion_ops;
451 /* read.c */
452 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
453 			struct inode *inode, bool force_mds,
454 			const struct nfs_pgio_completion_ops *compl_ops);
455 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
456 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
457 
458 /* super.c */
459 void nfs_umount_begin(struct super_block *);
460 int  nfs_statfs(struct dentry *, struct kstatfs *);
461 int  nfs_show_options(struct seq_file *, struct dentry *);
462 int  nfs_show_devname(struct seq_file *, struct dentry *);
463 int  nfs_show_path(struct seq_file *, struct dentry *);
464 int  nfs_show_stats(struct seq_file *, struct dentry *);
465 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
466 
467 /* write.c */
468 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
469 			struct inode *inode, int ioflags, bool force_mds,
470 			const struct nfs_pgio_completion_ops *compl_ops);
471 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
472 extern void nfs_commit_free(struct nfs_commit_data *p);
473 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
474 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
475 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
476 			       struct nfs_commit_data *data,
477 			       const struct nfs_rpc_ops *nfs_ops,
478 			       const struct rpc_call_ops *call_ops,
479 			       int how, int flags);
480 extern void nfs_init_commit(struct nfs_commit_data *data,
481 			    struct list_head *head,
482 			    struct pnfs_layout_segment *lseg,
483 			    struct nfs_commit_info *cinfo);
484 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
485 			 struct nfs_commit_info *cinfo, int max);
486 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
487 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
488 		    struct nfs_commit_info *cinfo);
489 void nfs_mark_request_commit(struct nfs_page *req,
490 			     struct pnfs_layout_segment *lseg,
491 			     struct nfs_commit_info *cinfo,
492 			     u32 ds_commit_idx);
493 int nfs_write_need_commit(struct nfs_pgio_header *);
494 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
495 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
496 			    int how, struct nfs_commit_info *cinfo);
497 void nfs_retry_commit(struct list_head *page_list,
498 		      struct pnfs_layout_segment *lseg,
499 		      struct nfs_commit_info *cinfo,
500 		      u32 ds_commit_idx);
501 void nfs_commitdata_release(struct nfs_commit_data *data);
502 void nfs_request_add_commit_list(struct nfs_page *req,
503 				 struct nfs_commit_info *cinfo);
504 void nfs_request_add_commit_list_locked(struct nfs_page *req,
505 		struct list_head *dst,
506 		struct nfs_commit_info *cinfo);
507 void nfs_request_remove_commit_list(struct nfs_page *req,
508 				    struct nfs_commit_info *cinfo);
509 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
510 		    struct inode *inode,
511 		    struct nfs_direct_req *dreq);
512 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
513 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
514 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
515 
516 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
517 		loff_t lstart, loff_t lend);
518 
519 #ifdef CONFIG_NFS_V4_1
520 static inline
nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info * cinfo)521 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
522 {
523 	int i;
524 
525 	for (i = 0; i < cinfo->nbuckets; i++)
526 		cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
527 }
528 #else
529 static inline
nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info * cinfo)530 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
531 {
532 }
533 #endif
534 
535 #ifdef CONFIG_MIGRATION
536 extern int nfs_migrate_page(struct address_space *,
537 		struct page *, struct page *, enum migrate_mode);
538 #endif
539 
540 static inline int
nfs_write_verifier_cmp(const struct nfs_write_verifier * v1,const struct nfs_write_verifier * v2)541 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
542 		const struct nfs_write_verifier *v2)
543 {
544 	return memcmp(v1->data, v2->data, sizeof(v1->data));
545 }
546 
547 /* unlink.c */
548 extern struct rpc_task *
549 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
550 		 struct dentry *old_dentry, struct dentry *new_dentry,
551 		 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
552 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
553 
554 /* direct.c */
555 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
556 			      struct nfs_direct_req *dreq);
557 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
558 
559 /* nfs4proc.c */
560 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
561 			    const struct nfs_client_initdata *);
562 extern int nfs40_walk_client_list(struct nfs_client *clp,
563 				struct nfs_client **result,
564 				const struct cred *cred);
565 extern int nfs41_walk_client_list(struct nfs_client *clp,
566 				struct nfs_client **result,
567 				const struct cred *cred);
568 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt,
569 				struct rpc_xprt *xprt,
570 				void *data);
571 
nfs_igrab_and_active(struct inode * inode)572 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
573 {
574 	struct super_block *sb = inode->i_sb;
575 
576 	if (sb && nfs_sb_active(sb)) {
577 		if (igrab(inode))
578 			return inode;
579 		nfs_sb_deactive(sb);
580 	}
581 	return NULL;
582 }
583 
nfs_iput_and_deactive(struct inode * inode)584 static inline void nfs_iput_and_deactive(struct inode *inode)
585 {
586 	if (inode != NULL) {
587 		struct super_block *sb = inode->i_sb;
588 
589 		iput(inode);
590 		nfs_sb_deactive(sb);
591 	}
592 }
593 
594 /*
595  * Determine the device name as a string
596  */
nfs_devname(struct dentry * dentry,char * buffer,ssize_t buflen)597 static inline char *nfs_devname(struct dentry *dentry,
598 				char *buffer, ssize_t buflen)
599 {
600 	char *dummy;
601 	return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
602 }
603 
604 /*
605  * Determine the actual block size (and log2 thereof)
606  */
607 static inline
nfs_block_bits(unsigned long bsize,unsigned char * nrbitsp)608 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
609 {
610 	/* make sure blocksize is a power of two */
611 	if ((bsize & (bsize - 1)) || nrbitsp) {
612 		unsigned char	nrbits;
613 
614 		for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
615 			;
616 		bsize = 1 << nrbits;
617 		if (nrbitsp)
618 			*nrbitsp = nrbits;
619 	}
620 
621 	return bsize;
622 }
623 
624 /*
625  * Calculate the number of 512byte blocks used.
626  */
nfs_calc_block_size(u64 tsize)627 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
628 {
629 	blkcnt_t used = (tsize + 511) >> 9;
630 	return (used > ULONG_MAX) ? ULONG_MAX : used;
631 }
632 
633 /*
634  * Compute and set NFS server blocksize
635  */
636 static inline
nfs_block_size(unsigned long bsize,unsigned char * nrbitsp)637 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
638 {
639 	if (bsize < NFS_MIN_FILE_IO_SIZE)
640 		bsize = NFS_DEF_FILE_IO_SIZE;
641 	else if (bsize >= NFS_MAX_FILE_IO_SIZE)
642 		bsize = NFS_MAX_FILE_IO_SIZE;
643 
644 	return nfs_block_bits(bsize, nrbitsp);
645 }
646 
647 /*
648  * Determine the maximum file size for a superblock
649  */
650 static inline
nfs_super_set_maxbytes(struct super_block * sb,__u64 maxfilesize)651 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
652 {
653 	sb->s_maxbytes = (loff_t)maxfilesize;
654 	if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
655 		sb->s_maxbytes = MAX_LFS_FILESIZE;
656 }
657 
658 /*
659  * Record the page as unstable and mark its inode as dirty.
660  */
661 static inline
nfs_mark_page_unstable(struct page * page,struct nfs_commit_info * cinfo)662 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
663 {
664 	if (!cinfo->dreq) {
665 		struct inode *inode = page_file_mapping(page)->host;
666 
667 		inc_node_page_state(page, NR_UNSTABLE_NFS);
668 		inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
669 		__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
670 	}
671 }
672 
673 /*
674  * Determine the number of bytes of data the page contains
675  */
676 static inline
nfs_page_length(struct page * page)677 unsigned int nfs_page_length(struct page *page)
678 {
679 	loff_t i_size = i_size_read(page_file_mapping(page)->host);
680 
681 	if (i_size > 0) {
682 		pgoff_t index = page_index(page);
683 		pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
684 		if (index < end_index)
685 			return PAGE_SIZE;
686 		if (index == end_index)
687 			return ((i_size - 1) & ~PAGE_MASK) + 1;
688 	}
689 	return 0;
690 }
691 
692 /*
693  * Convert a umode to a dirent->d_type
694  */
695 static inline
nfs_umode_to_dtype(umode_t mode)696 unsigned char nfs_umode_to_dtype(umode_t mode)
697 {
698 	return (mode >> 12) & 15;
699 }
700 
701 /*
702  * Determine the number of pages in an array of length 'len' and
703  * with a base offset of 'base'
704  */
705 static inline
nfs_page_array_len(unsigned int base,size_t len)706 unsigned int nfs_page_array_len(unsigned int base, size_t len)
707 {
708 	return ((unsigned long)len + (unsigned long)base +
709 		PAGE_SIZE - 1) >> PAGE_SHIFT;
710 }
711 
712 /*
713  * Convert a struct timespec into a 64-bit change attribute
714  *
715  * This does approximately the same thing as timespec_to_ns(),
716  * but for calculation efficiency, we multiply the seconds by
717  * 1024*1024*1024.
718  */
719 static inline
nfs_timespec_to_change_attr(const struct timespec * ts)720 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
721 {
722 	return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
723 }
724 
725 #ifdef CONFIG_CRC32
726 /**
727  * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
728  * @fh - pointer to filehandle
729  *
730  * returns a crc32 hash for the filehandle that is compatible with
731  * the one displayed by "wireshark".
732  */
nfs_fhandle_hash(const struct nfs_fh * fh)733 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
734 {
735 	return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
736 }
nfs_stateid_hash(const nfs4_stateid * stateid)737 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
738 {
739 	return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
740 				NFS4_STATEID_OTHER_SIZE);
741 }
742 #else
nfs_fhandle_hash(const struct nfs_fh * fh)743 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
744 {
745 	return 0;
746 }
nfs_stateid_hash(nfs4_stateid * stateid)747 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
748 {
749 	return 0;
750 }
751 #endif
752 
nfs_error_is_fatal(int err)753 static inline bool nfs_error_is_fatal(int err)
754 {
755 	switch (err) {
756 	case -ERESTARTSYS:
757 	case -EINTR:
758 	case -EACCES:
759 	case -EDQUOT:
760 	case -EFBIG:
761 	case -EIO:
762 	case -ENOSPC:
763 	case -EROFS:
764 	case -ESTALE:
765 	case -E2BIG:
766 	case -ENOMEM:
767 	case -ETIMEDOUT:
768 		return true;
769 	default:
770 		return false;
771 	}
772 }
773 
nfs_error_is_fatal_on_server(int err)774 static inline bool nfs_error_is_fatal_on_server(int err)
775 {
776 	switch (err) {
777 	case 0:
778 	case -ERESTARTSYS:
779 	case -EINTR:
780 	case -ENOMEM:
781 		return false;
782 	}
783 	return nfs_error_is_fatal(err);
784 }
785